diff --git a/auth2-chall.c b/auth2-chall.c
index 980250a..ea4eb69 100644
--- a/auth2-chall.c
+++ b/auth2-chall.c
@@ -41,6 +41,7 @@
 #include "packet.h"
 #include "dispatch.h"
 #include "log.h"
+#include "misc.h"
 #include "servconf.h"
 
 /* import */